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<BODY bgcolor=#F0F0F0 text=#000000 link=#0000ff vlink=#C000C0 alink=#ff0000><A NAME=top></A>
<h5><a href="https://github.com/urbanjost/M_strings">[UP]</a></h5>
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<CENTER>
<H1><HR><I>Manual Reference Pages &nbsp;-&nbsp;</I><NOBR>switch (3m_strings)</NOBR><HR></H1>
</CENTER>
<A name=0>

     <H3>NAME</H3>

</A>
<BLOCKQUOTE>
<P>
<B>switch</B>(3f) - [M_strings:ARRAY] converts between CHARACTER scalar and
array of single characters
(LICENSE:PD)
<P>
</BLOCKQUOTE>
<A name=contents></A><H3>CONTENTS</H3></A>
<BLOCKQUOTE>
<A HREF=#1>Synopsis</A><BR>
<A HREF=#2>Description</A><BR>
<A HREF=#3>Examples</A><BR>
<A HREF=#4>Author</A><BR>
<A HREF=#5>License</A><BR>
</BLOCKQUOTE>
<A name=6>

     <H3>SYNOPSIS</H3>

</A>
<BLOCKQUOTE>
pure function <B>switch</B>(<I>array</I>) result (<I>string</I>)
<P>
<PRE>
    character(len=1),intent(in) :: array(:)
    character(len=SIZE(array))  :: string
<P>
     or
<P>
</PRE>
pure function <B>switch</B>(<I>string</I>) result (<I>array</I>)
<P>
<PRE>
    character(len=1),intent(in) :: array(:)
    character(len=SIZE(array))  :: string
<P>
</PRE>
</BLOCKQUOTE>
<A name=2>

     <H3>DESCRIPTION</H3>

</A>
<BLOCKQUOTE>
<B>SWITCH</B>(3f): generic function that switches CHARACTER <I>string</I> to an <I>array</I>
of single characters or an <I>array</I> of single characters to a CHARACTER
<I>string</I>. Useful in passing strings to C. New Fortran features may
supersede these routines.
</BLOCKQUOTE>
<A name=3>

     <H3>EXAMPLES</H3>

</A>
<BLOCKQUOTE>
Sample program:
<P>
<PRE>
   program demo_switch
   use M_strings, only : switch, isalpha, islower, nospace
   character(len=*),parameter :: &
   & dashes=&#146;-----------------------------------&#146;
   character(len=*),parameter :: string=&#146;This is a string&#146;
   character(len=1024)        :: line
<P>
   ! First, examples of standard Fortran features
   ! returns array [F,T,T,T,T,T]
   write(*,*)[&#146;A&#146;,&#146;=&#146;,&#146;=&#146;,&#146;=&#146;,&#146;=&#146;,&#146;=&#146;].eq.&#146;=&#146;
   ! this would return T
   write(*,*)all([&#146;=&#146;,&#146;=&#146;,&#146;=&#146;,&#146;=&#146;,&#146;=&#146;,&#146;=&#146;].eq.&#146;=&#146;)
   ! this would return F
   write(*,*)all([&#146;A&#146;,&#146;=&#146;,&#146;=&#146;,&#146;=&#146;,&#146;=&#146;,&#146;=&#146;].eq.&#146;=&#146;)
<P>
   ! so to test if the string DASHES is all dashes
   ! using SWITCH(3f) is
   if(all(switch(dashes).eq.&#146;-&#146;))then
      write(*,*)&#146;DASHES is all dashes&#146;
   endif
<P>
   ! so to test is a string is all letters
   ! isalpha(3f) returns .true. only if character is a letter
   ! false because dashes are not a letter
   write(*,*) all(isalpha(switch(dashes)))
   ! false because of spaces
   write(*,*) all(isalpha(switch(string)))
   ! true because removed whitespace
   write(*,*) all(isalpha(switch(nospace(string))))
<P>
   ! to see if a string is all uppercase
   ! show the string
   write(*,*) string
   ! converted to character array
   write(*,&#146;(1x,*("[",a,"]":))&#146;) switch(string)
   write(*,&#146;(*(l3))&#146;) islower(switch(string))
<P>
   ! we need a string that is all letters
   line=nospace(string)
   write(*,*)&#146;LINE=&#146;,trim(line)
   ! all true except first character
   write(*,*) islower(switch(nospace(string)))
   ! should be false
   write(*,*) all(islower(switch(nospace(string))))
   ! should be true
   write(*,*) all(islower(switch(nospace(string(2:)))))
<P>
   end program demo_switch
<P>
</PRE>
Expected output
</BLOCKQUOTE>
<A name=>

    <H4>&nbsp; &nbsp; F T T T T T</H4>
</A>
<BLOCKQUOTE>
</BLOCKQUOTE>
<A name=>

    <H4>&nbsp; &nbsp; T</H4>
</A>
<BLOCKQUOTE>
</BLOCKQUOTE>
<A name=>

    <H4>&nbsp; &nbsp; F</H4>
</A>
<BLOCKQUOTE>
DASHES is all dashes
</BLOCKQUOTE>
<A name=>

    <H4>&nbsp; &nbsp; F</H4>
</A>
<BLOCKQUOTE>
</BLOCKQUOTE>
<A name=>

    <H4>&nbsp; &nbsp; F</H4>
</A>
<BLOCKQUOTE>
</BLOCKQUOTE>
<A name=>

    <H4>&nbsp; &nbsp; T</H4>
</A>
<BLOCKQUOTE>
This is a <I>string</I>
[T][h][i][s][ ][i][s][ ][a][ ][s][t][r][i][n][g]
</BLOCKQUOTE>
<A name=>

    <H4>&nbsp; &nbsp; F T T T F T T F T F T T T T T T</H4>
</A>
<BLOCKQUOTE>
LINE=Thisisastring
</BLOCKQUOTE>
<A name=>

    <H4>&nbsp; &nbsp; F T T T T T T T T T T T T</H4>
</A>
<BLOCKQUOTE>
</BLOCKQUOTE>
<A name=>

    <H4>&nbsp; &nbsp; F</H4>
</A>
<BLOCKQUOTE>
</BLOCKQUOTE>
<A name=>

    <H4>&nbsp; &nbsp; T</H4>
</A>
<BLOCKQUOTE>
<P>
</BLOCKQUOTE>
<A name=4>

     <H3>AUTHOR</H3>

</A>
<BLOCKQUOTE>
John S. Urban
</BLOCKQUOTE>
<A name=5>

     <H3>LICENSE</H3>

</A>
<BLOCKQUOTE>
Public Domain
</BLOCKQUOTE>
<P><HR>
<TABLE width=100%><TR> <TD width=33%><I>Nemo Release 3.1</I></TD> <TD width=33% align=center>switch (3m_strings)</TD> <TD align=right width=33%><I>April 30, 2022</I></TD> </TR></TABLE><FONT SIZE=-1>Generated by <A HREF="http://www.squarebox.co.uk/download/manServer.shtml">manServer 1.08</A> from 4e5ff032-f115-474a-9863-fdd5c08060cf using man macros.</FONT>
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